PIC14000-20/SS Microchip Technology, PIC14000-20/SS Datasheet - Page 45

• Manufacturer Part Number: PIC14000-20/SS
• Description: IC MCU OTP 4KX14 A/D 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 14r

Specifications of PIC14000-20/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C
• Peripherals: POR, Temp Sensor, WDT
• Number Of I /o: 20
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: Slope A/D
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Processor Series: PIC14000
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 192 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 1
• Operating Supply Voltage: 2.7 V to 6 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: 0 C
• On-chip Adc: 14 bit
• For Use With: 309-1025 - ADAPTER 28-SSOP TO 28-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

7.3
All data must be transmitted per byte, with no limit to
the number of bytes transmitted per data transfer. After
each
acknowledge bit (ACK). This is shown in Figure 7-6.
When a slave-receiver doesn’t acknowledge the slave
address or received data, the master must abort the
transfer. The slave must leave SDA high so that the
master can generate the STOP (Figure 7-1).
If the master is receiving the data (master-receiver), it
generates an acknowledge signal for each received
byte of data, except for the last byte. To signal the end
of data to the slave-transmitter, the master does not
generate an acknowledge. The slave then releases the
SDA line so the master can generate the STOP. The
master can also generate the STOP during the
acknowledge pulse for valid termination of data
transfer.
If the slave needs to delay the transmission of the next
byte, holding the SCL line low will force the master into
a wait state. Data transfer continues when the slave
releases the SCL line. This allows the slave to move
the received data or fetch the data it needs to transfer
before allowing the clock to start. This wait state can be
FIGURE 7-7:
1996 Microchip Technology Inc.
SDA
SCL
byte,
Transfer Acknowledge
Condition
Start
S
the
SAMPLE I
MSB
slave-receiver
1
Address
2
2
C DATA TRANSFER
acknowledgement
signal from receiver
generates
7
R/W
8
Preliminary
an
ACK
9
byte complete.
interrupt with receiver
Wait
State
accomplished by setting SMHOG (MISC<7>) high.
Clearing MISC<7> will resume the data transfer.
Figure 7-7 shows a data transfer waveform.
Figure 7-8 and Figure 7-9 show master-transmitter and
master-receiver data transfer sequences.
FIGURE 7-6:
clock line held low while
interrupts are serviced
1
Transmitter
Output by
Output by
SCL from
Receiver
Master
Data
Data
Data
2
Condition
Start
S
acknowledgement
signal from receiver
3 • 8
I
ACKNOWLEDGE
2
C SLAVE-RECEIVER
1
ACK
9
2
PIC14000
not acknowledge
Condition
acknowledge
DS40122B-page 45
Stop
8
P
acknowledgement
Clock pulse for
9